Magnetic Sensor
It is used with a magnet placed on the pulley of the treadmill or exercise bike, different types available (round-shaped or square). Connector has two pins, cable length is 110 cm.
Buy Treadmill Speed Sensor | Magnetic
Optical Sensor
It is connected to the motor fan and reads speed directly from motor fan. There are two main versions: with 4-pin cable or 3-pin cable.
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